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Diet of the Chilean Flamingo Phoenicopterus Chilensis

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Diet of the Chilean Flamingo Phoenicopterus Chilensis Tobar et al. Revista Chilena de Historia Natural 2014, 87:15 http://www.revchilhistnat.com/content/87/1/15 RESEARCH Open Access Diet of the Chilean flamingo Phoenicopterus chilensis (Phoenicopteriformes: Phoenicopteridae) in a coastal wetland in Chiloé, southern Chile Claudio N Tobar1*, Jaime R Rau2, Norka Fuentes3, Alberto Gantz2, Cristián G Suazo4, Jaime A Cursach2,5, Alexis Santibañez1 and Jorge Pérez-Schultheiss6 Abstract Background: The geographical distribution of the Chilean flamingo (Phoenicopterus chilensis) includes the southern-central Neotropics. Despite its wide distribution, currently there is no dietary information on its southern distribution range. From June to September 2011, we quantified the diet and prey availability of the Chilean flamingo in the marine wetland of Caulín (41°48' S, 73°37' W), southern Chile. Results: The prey availability related to both plankton and benthos were four species of copepods, four polychaetes, one foraminifera, and two amphipods. The diet of the Chilean flamingo was composed of foraminifera (Ammonia beccarii), copepods (Harpacticus sp.) and polychaetes. The most abundant prey items from feces of flamingos were Ammonia beccarii and Harpacticus sp. The diameter of A. beccarii consumed by flamingos ranged between 400 and 900 μm, while its width varied between 100 and 300 μm. The width of Harpacticus sp. consumed ranged between 160 and 260 μm. The similarity between flamingo diet and prey availability was 0.553. The diversity of prey organisms in the benthos was higher than that observed from plankton and feces of birds. A. beccarii was preferred over other prey consumed by flamingos. This preference is not related to the size of Harpacticus sp. but to their ability to swim and escape from flamingos. Conclusions: The dietary similarity of the Chilean flamingo versus the availability of prey in the environment (plankton and benthos) was 55%, indicating that the Chilean flamingo is a partially selective predator. Keywords: Copepods; Diet selectivity; Migration; Trophic ecology Background bird in Chile, it only nests in the extreme North (Venegas There are six species of flamingo in existence worldwide, 1986), while the populations found in the South nest in and three of them are found in the Neotropical region. Argentinean Patagonia (Von Meyer and Espinosa 1998). The most common species in this region is the Chilean The ecological information published on this species flamingo Phoenicopterus chilensis (Molina 1782) (Brandolin makes reference to observations on certain reproductive and Ávalos 2010). Its range stretches from the center-south aspects (Sosa 1999), geographical distribution and popula- coasts of Peru and the south of Brazil to Patagonia (Hurlbert tion fluctuations (Johnson et al. 1958; Caziani et al. 2001, and Keith 1979; Fjeldsa and Krabbe 1990; Parada 1990; 2007; Rocha 1997), nesting, habitat use (Mascitti 2001; Rodríguez and Contreras 1998; Araya and Millie 2005). In Mascitti and Bonaventura 2002; Mascitti and Castañera Chile, this species is currently found from the Parinacota 2006), and conservation status (Bucher 1992). If we con- Province (ca. 20° S) to Tierra del Fuego (ca. 52 °S) (Araya sider its widespread population distribution throughout and Millie 2005). With regard to the nesting habits of this the country, there are currently no existing publications about the Chilean flamingo's diet nor do we know the prey selection strategy (selective or opportunistic) it uses in the Q3 * Correspondence: [email protected] different environments in which it lives. The study carried 1Departamento de Ciencias Básicas, Universidad Santo Tomás, Los Carrera 753, 5310431, Osorno, Chile out by Mascitti and Kravetz (2002) on the Chilean flamingo Full list of author information is available at the end of the article © 2014 Tobar et al.; licensee Springer. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. Tobar et al. Revista Chilena de Historia Natural 2014, 87:15 Page 2 of 7 http://www.revchilhistnat.com/content/87/1/15 and the Andean flamingo (Phoenicoparrus andinus Philippi 2011. Sampling days coincided with the lowest tides, 1854) and James's flamingo (Phoenicopterus jamesi, Sclater allowing for a greater surface area for sample collection. 1886) in the Argentinean Andean Plateau do indicates, Potential prey profile availability was quantified, and their however, that these species select their prey based on size feces were collected for diet evaluation. The Caulín Bay due to a distinctive characteristic of their beaks, which (41° 49′ S, 73° 38′ W) bird sanctuary is found in the contain small ridges to capture food when filtering the northern zone of Chiloé's Isla Grande Island, southern substrate. Other authors describe the Chilean flamingo as Chile (Figure 1). The sand flat features an annual average an omnivorous bird that feeds principally on diatoms, tide height of around 4.5 m at spring tide and 3 m at neap nematodes, and planktonic crustaceans (Hurlbert 1982; tide (Cifuentes 2007). The intertidal strip is approximately Hurlbert et al. 1986; Rodríguez 2005). According to the re- 600 m at spring tide (Cifuentes 2007). The River Huenque cords of Von Meyer and Espinosa (1998), the Chilean fla- runs through the middle of the sand flat, dividing it into mingo keeps to the intertidal flats of Chiloé's island called two sectors. The eastern sector is primarily muddy, while Isla Grande to feed for most of the year except in summer. the western sector is primarily sandy (Cifuentes 2007). The The presence of this species in the south of Chile and intertidal zone of Caulín Bay is subject to the constant specifically in Chiloé could be related to its migratory harvesting of sea products, especially the collection and routes as it moves towards Argentinean Patagonia in the cultivation of pelillo seaweed (Gracilaria chilensis Bird, spring and summer in search of nesting sites (Markham McLachlan and Oliveira 1986) and Bluff oyster (Ostrea 1975; Von Meyer and Espinosa 1998). Its presence on the chilensis Philippi 1845). coast of the central and southern regions of Chile is largely associated with estuarial areas, which could be Sampling methodology related to the higher quantity of food available in this kind The Chilean flamingo's available food and the variation of habitat during the winter season, as is the case with of that food over the different months were character- other migratory birds (Muñoz 1994; Cifuentes 2007). The ized. Samples of plankton were taken at the feeding sites protected coastal areas of the Chiloé Ecoregion and the and the control sites. The feeding sites were located in Patagonian waterways in the south of Chile (ca. 42° to the intertidal zone of Caulín Bay and were chosen based 43° S) provide a combination of nutritional resources and on observation of the bioperturbations left by the Chilean rest areas for resident and migratory birds. They are one flamingo during feeding. The bioperturbation is known as of the main wintering sites in the south of the American a ‘feeding ring’, and it is produced by the birds' feet churn- continent for various species of coastal bird. This results ing up the benthos as it swivels on its axis and uses its from a combination of the area's oceanographic product- body as a pivot. It filters the suspended sediment with its ivity and its topography (Morrison and Ross 1989). These beak and then deposits the filtered sediment in the center protected intertidal areas contain high concentrations of of the ring (Cifuentes 2007). In order to sample the phytoplankton (Avaria et al. 1997), which allow macro- zooplankton, horizontal sweeps of 800-m transects were benthic communities to be sustained (Quijón and Jaramillo made perpendicular to the tideline. To avoid stirring up 1993). These macrobenthic communities display seasonal sediment in the Chilean flamingo's feeding sites, these variations in the abundance of benthic organisms. On the were undertaken as discreet walks using conical plankton other hand, in spite of the high diversity of resident and nets (net mouth area 0.3 m diameter by 1.2 m in length), migratory aquatic birds that live in Caulín Bay, there is in with a mesh size of 150 μm, to obtain a total of 12 fact no existing information on prey availability in the samples. benthos of the bay's intertidal zone (Cifuentes 2007). The taxonomic analysis was carried out in the labora- As a result, the objectives of this study were to present tory with a stereoscopic microscope (×10 to ×30) and an the first quantifiable information on the diet of the Chilean optical microscope (OM) with ×400 magnification. flamingo, to quantify potential prey profile availability Taxonomic guides (Araya and Zúñiga 1985; Goddard (zooplankton and benthos), and to determine the size of and Zúñiga 1995) and OM photographs of the different prey consumed in a marine wetland on the Isla Grande taxa were used to identify the prey. The OM photographs island in Chiloé, southern Chile. Our hypothesis was as were taken with the aid of a photographic camera (Sony follows: The Chilean flamingo will not show evidence of DSC-HX200V, Sony Corporation, Tokyo, Japan) incorpo- dietary selection and will consume the prey present in rated into the microscope. Once the samples were classi- Caulín Bay opportunistically. fied, the frequency that each prey animal appeared was determined. In turn, the abundance and size of each prey Methods animal were recorded for the most frequent prey animals. Study area To record the abundance of the most frequent zooplank- Visits to Caulín Bay were carried out over three con- ton prey, a count was carried out using transects accord- secutive days between the months of June and September ing to the method proposed by Villafañe and Reid (1995).
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